2014, Volume 16, Issue 3
Strategic Study of CAE >> 2014, Volume 16, Issue 3
Research of the aerostatic and aerodynamic stability of super long-span cable-stayed bridges
Zhejiang University of Technology，Hangzhou 310014，China
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Abstract
With the increase of span length，the cable-stayed bridge tends to be a more slender structural system，and consequently the wind stability becomes an important problem for its design and construction. Three-dimensional nonlinear aerostatic and aerodynamic stability analysis of long-span bridges is used to investigate the aerostatic and aerodynamic stability of a super long- span cable- stayed bridge with main span of1400m，and the results are compared with those of a suspension bridge with the similar main span，and considering from the aspect of wind stability，the availability of using the cable- stayed bridge in super long- span bridges whose main span exceeds1000m is discussed. In addition，parametric analysis on the aerostatic and aerodynamic stability of super long-span cable-stayed bridges is conducted including the depthand width of the girder，structure style of the tower，the tower’s height-to-spanratio，the ratio of side span to main span，the auxiliary piers in the side span and the anchorage system of stay cables etc，and the key design parameters are pointed out，and also their reasonable values are proposed. The results show that as compared to the suspension bridge with the same main span，the cable- stayed bridge has greater structural stiffness，and becomes more stable under the static and dynamic wind action，and consequently becomes a favorable structural system for super long- span bridges whose main span exceeds1000m；the super long- span cable- stayed bridge becomes more aerostatically and aerodynamically stable under the cases that the girder depth is increased，the girder width is decreased，the inverse Y-shaped tower is used，the tower’s height is increased，the side span is shortened，the auxiliary piers are installed in side span and the stayed cables are partially earth-anchored.
Keywords
super long-span cable-stayed bridge ; aerostatic stability ; aerodynamic stability ; design parameter
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